Malicious PDF — malware analysis report

Static analysis result for SHA-256 127a2338a13209f7…

MALICIOUS

PDF

78.2 KB Created: 2021-09-20 06:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 96cb84339d2725b425f85a0ef58bbe7c SHA-1: 49969bc656fbb74ca291d41420f5d7034ec0d39a SHA-256: 127a2338a13209f72ea4f47fe223f2b70c1189e31c76cc8fd540b174fb54a3ec
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document is designed to trick users into downloading a password-protected archive, a common tactic for bypassing gateway security. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://synerhu.ru/uplcv?utm_term=how+to+take+pin+lock+off+phone PDF link annotation
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161356adfbc5af---toxataxopoda.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/bogodetizejidiruporok.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/60535666813.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/69946807871.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/vabefidibo.pdfIn PDF document text
    • https://ms1oke.com/contents/files/9352800904.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/linodaxumodixokesopeb.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1614558d204fd4---12577316091.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/27733001730.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/75771029473.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/ribupubiluranusaladoxar.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/59785821035.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/zugawesiwalefe.pdfIn PDF document text
    • http://blueyee.com/upload/file/180554486069.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/43116197628.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/78361760992.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/89509288452.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/49515031260.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/wapebatevetipibirefirew.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/92655182534.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC8 17196 bytes
SHA-256: 8d3516b9c6885a038ed9dd8cbcfaf0cb3f20a98a00a0e4a6ba3cb8365bce5bb0
font_01_sfnt_off0000fb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4B 10480 bytes
SHA-256: 1d75e4457274f5cc893c9caccf85e6a7c1fcf2c663c683dbc975911fb376448e
font_02_sfnt_off0001130e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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